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From: ianhogg@cs.umn.edu (Ian J. Hogg)
Newsgroups: comp.lang.c++
Subject: Re: Pointers to Member Functions
Message-ID: <1990Dec7.053119.18866@cs.umn.edu>
Date: 7 Dec 90 05:31:19 GMT
References: <1369@christopher-robin.cs.bham.ac.uk>
Organization: University of Minnesota, Minneapolis - CSCI Dept.
Lines: 35

In article <1369@christopher-robin.cs.bham.ac.uk> idf@cs.bham.ac.uk (Ian Fitchet <FitchetI>) writes:
>
> I came across a problem while trying to explain pointers to functions
>from a C perspective in a C++ tutorial. This failed so I looked it up
>in a book which said that the following code should be valid.
>
>#include <stream.h>
>class foo {
>  int a;
>public:
>  foo() { a = 1; }
>  void print() { cout << a << "\n"; }
>  void bar() { a = 3; }
>};
>main()
>{
>  void (foo::*ptr2bar)() = &foo::bar;
>  foo bletch;
>  
>  cout << "Initially a = " ;
>  bletch.print();
>  bletch.(*ptr2bar)();
   ^^^^^^^^^^^^^^^^^^^^^^
   (bletch.*ptr2bar)();

>  cout << "Finally a = ";
>  bletch.print();
>}
>

Compiles and runs fine on HP's cfront 2.0.  Lippman's book discusses this on
pages 211-212.

==============================================================================
Ian Hogg   ian@dms.cdc.com